You can treat this wish as accepted, I have it with my "interesting wishes list" for a while. We will back to implementing Data Forms related things in nearest month, and then I will mark some Data Forms wishes as accepted.

I realize that this is quite old by now, but I'm curious—has any more progress been made on this? It'd be wonderful to have for the template I'm working on right now, since it relies pretty heavily on the wikitext field and some users might potentially be more comfortable with a toolbar to help them along. :)